What is the medical term for excessive bleeding during or between periods?

The term that describes excessive bleeding during or between menstrual periods is menorrhagia. Menorrhagia specifically refers to menstrual bleeding that is heavier than normal or prolonged. This condition can lead to significant health issues, including anemia, due to the loss of blood, and it can significantly affect a person's quality of life.

Dysmenorrhea refers to painful menstruation, typically characterized by cramping and is not related to the amount of menstrual bleeding. Amenorrhea means the absence of menstruation, while hypermenorrhea can imply an increase in the volume of menstrual bleeding but is less commonly used and defined than menorrhagia. Thus, menorrhagia is the most accurate and widely recognized term to describe the condition of excessive bleeding during or between menstrual cycles.